Array-vs-Object

JavaScript performance comparison

Test case created by Inez Korczyński

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    function Annotation() {}
};
</script>

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Testing in unknown unknown
Test Ops/sec
array
var data = [];
for (var i = 0; i < 100000; i++) {
  if (i % 2 === 0) {
    data[i] = ["a"];
  } else {
    data[i] = ["b", new Annotation()];
  }
}
pending…
object
function Data(annotation) {
  this.annotation = annotation;
}
var data = [];
for (var i = 0; i < 100000; i++) {
  if (i % 2 === 0) {
    data[i] = ["a"];
  } else {
    data[i] = ["b", new Annotation("b")];
  }
}
pending…

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